A bar slides vertically between two conducting rails without friction in a magnetic field. The rails are connected via a resistor. The bar reaches a constant velocity and slides for 2m. How much energy is dissipated in the resistor during these 2m's

The energy dissipated is  

Explanation:

From the question we are told that

    The distance covered at constant velocity d =  2 m  

      The velocity is  

Generally at constant velocity the magnetic  force on the bar is mathematically represented as

substituting values

The energy dissipated is mathematically evaluate as

 substituting the value

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